Short communication: influence of Staphylococcus aureus intramammary infection on serum copper, zinc, and iron concentrations |
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Authors: | Middleton J R Luby C D Viera L Tyler J W Casteel S |
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Affiliation: | Department of Veterinary Medicine and Surgery, University of Missouri, Columbia 65211, USA. middletonjr@missouri.edu |
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Abstract: | The goal of the present study was to characterize changes in serum trace mineral concentrations in cattle with experimentally induced Staphylococcus aureus mastitis. Nine primiparous Holstein-Friesian cattle were challenged with approximately 150 cfu of Staph. aureus ATCC29740 by intramammary infusion on d 6, 7, and 8 of lactation. Serum Cu, Zn, and Fe concentrations were determined immediately before and at 24, 48, and 72 h after the final intramammary infusion of Staph. aureus. Infection status (cfu/mL of Staph. aureus), milk somatic cell count, and mastitis score were also determined at these times. Infection resulted in a decrease in mean serum Cu, Zn, and Fe concentrations to 89, 83, and 81% of preinfection concentrations at 24 h postchallenge. One-way analysis of variance for repeated measures demonstrated a significant change in serum zinc concentration. The reductions in trace mineral concentrations were of less magnitude than observed following experimental E. coli mastitis. |
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Keywords: | Staphylococcus aureus mastitis copper zinc iron |
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